213809856 has 56 divisors (see below), whose sum is σ = 609228144. Its totient is φ = 65786880.

The previous prime is 213809851. The next prime is 213809857. The reversal of 213809856 is 658908312.

It is not an unprimeable number, because it can be changed into a prime (213809851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40335 + ... + 45326.

It is an arithmetic number, because the mean of its divisors is an integer number (10879074).

Almost surely, 2^213809856 is an apocalyptic number.

213809856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

213809856 is an abundant number, since it is smaller than the sum of its proper divisors (395418288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213809856 is a wasteful number, since it uses less digits than its factorization.

213809856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85689 (or 85679 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 213809856 is about 14622.2384059350. The cubic root of 213809856 is about 597.9651959774.

The spelling of 213809856 in words is "two hundred thirteen million, eight hundred nine thousand, eight hundred fifty-six".